potter



(No Model.) T 2 Sheets-Sheet 2". T V 0. POTTER, Jr.

LITHOGRAPHIG PRINTING MACHINE,

Patented May 5, 1885.

It PETERS. Phniolllhom. Wuh'lvllm D. C-

UNITED STATES 1 PATENT OFFICE.

CHARLES POTTER, JR., OF PLAINEIELD, NEW JERSEY.

LITHOGRAPHIC-PRINTING MACHINE.

EPECIFICATION forming part of Letters Patent No. 317,194, datedApplication filed July 1, 1884. (No model.)

May 5, 1885.

the rollers in the water-trough and the rollers that supply the water tothe printing-surface. This vibrating roller is usually of felt or otherabsorbent material, and the quantity of water supplied to theprinting-surface depends upon the length of time the felt roller is incontact with the roller that revolves in the water-trough. In pressesheretofore built the vibrating roller has been placed upon armsconnected with a cross-shaft, and upon this shaft there has been aslotted lever with an adjustable roller, and upon the bed of the press awedge having a horizontal portion to run over the adjustable roller andaccording to the horizontal adjustment of the roller, so the same wasacted upon sooner or later in the reciprocation ofthe bed by the wedgeto bring the vibrating transfer-roller into contact with thewater-roller and hold the same fora greater or less length of time. Inthe adjustment of the roller it is brought nearer to or farther from thefulcrum of the lever, and the extent of motion given to the vibrator isnot uniform, and it presses hardest againstthe waterroller when itremains the longest in contact therewith. In cases where the adjustmenthas been made at an intermediate lever, the whole lever and fulcrum havehad to be moved. 7

My invention is made for overcoming this last-named difficulty, and'foradjusting thetime of contact of the vibrating roller with thewater-roller without stopping the press, and without varying theamountof motion given to the vibrating roller. I also provide means foradjustingthe position of the vibrat- The reciprocating bed A is adaptedto receive the stone or other printing-surface. The wetting-rollers B 0,intermediate roller, B, water-trough I), water-roller E, and vibratingroller F are of any knownor desired character. I The jaws g, at the endsof arms upon the cross-shafts h, serve to hold and move the vibratingroller F.

The wedge k, upon the bed A, and the rollstead of the axis of the rollerZ being held in a slotted lever extending out from the shaft h, I placethe said axisin the horizontal slot 13 of the crossm. This slotted crossm is united at its upper end by a j oint to the lever-arm 0 that extendsfrom the shaft h. j I preferto introduce a connecting-link, p, pivotedat one s end to the lever 0 and at the other end to the slotted crossm,- and an adjusting-screw, 1),.

holds the link 1) firmly to the lever 0, but allows of adjusting theparts to regulate the poer Zare similar to those before used; but inmand held. I prefer to use the screw r,passing through this block likethe screw in a slide-rest, so that the block and roller can be adjustedwhile the press is running, and they will be securely held.

The slotted cross is guided at its lower end preferably by a pin, 13, ina slot,andaspring, u, acts to lift the cross and move the lever and.vibrating roller, so that thelatter remains in contact with theintermediate roller, B, above the wetting-rollers O D, except when thewedge-7c on the press runs over and depresses the roller Z and moves thevibrating roller F into contact with thewater-roller E.

It will now be understood that the slot of the cross beinghorizontahan'd the movement to the rock-shaft h and vibrating roller F Iwill always be the same, the ,adjustmentof the roller Zsimply varyinginthetimeduring which the vibrating roller is receiving water from thewater-trough roller, and hence the foo and lever-arm,of the link andadjusting-screw 1', the vibrating roller, and the trough andwater-roller, substantially as set forth.

3. The combination, with the wedge on the bed, of the roller, theslotted cross, the adjusting-screw 1', the lever-arm, rock-shaft,adjusting-link, and vibrating roller substantially as specified.

Signed by me this 10th day of June, A. D. 1884.

CHARLES POTTER, JR.

\Vitn esses:

GEO. T. PINcKNEY, WILLIAM G. MOTT.

